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1、※分析檢測JournalofDairyScienceandTechnology2014,VoL37No.38高效液相色譜.串聯(lián)質譜法快速測定乳與乳粉中20種同化激素蔡瑋紅,何敏恒,李秀英,黃金風,杜偉鋒,李佩斯,冼燕萍,侯向昶,郭新東木(廣州質量監(jiān)督檢測研究院國家加工食品質量監(jiān)督檢驗中心(廣帥1),廣東廣』、I,I510110)摘要:建立了液相色譜.電噴霧串聯(lián)質譜同時測定乳與乳粉中11種甾類和9種一受體激動劑類同化激素的快速確證方法。樣品經體積分數(shù)0.1%甲酸乙腈溶液提取,正己烷脫脂,HLB固相萃取柱凈化后,以0.1%甲酸甲醇一0.1%甲
2、酸水為流動相梯度洗脫,通過C色譜柱分離,電噴霧正離子多反應監(jiān)測模式檢測。在優(yōu)化條件下,20種目標物在O.05~50I,tg/L范圍內線性良好,相關系數(shù)均大于0.996;方法定量限(RsN=10)在0.1~1.0Ixg/kg之間;不同添加水平回收率為52.8%~97.4%,相對標準偏差(=6)為2.8%~9.6%。多種市售純牛奶和乳粉的測定結果表明,該方法操作簡單、測定結果準確,可用于乳與乳粉中甾類和受體激動劑類激素多殘留的快速測定。關鍵詞:液相色譜.電噴霧串聯(lián)質譜;甾類;.受體激動劑;乳;乳粉QuickDeterminationof20A
3、nabolicHormonesinMilkandMilkPowderbyLC·-MS-MSCAIWei-hong,HEMin-heng,LIXiu-ying,HUANGJin-feng,DUWei—feng,LIPei—si,XIANYan-ping,HOUXiang—chug,GUOXin—dong:(GuangzhouQualitySupervisionandTestingInstitute,NationalCentreforQualitySupervisionandTestingofProcessedFood(Guangzhou),
4、Guangzhou510110,China)Abstract:Aquickconfirmativemethodforthedeterminationofresidualamountsof11anabolichormonesand9agonistsinmilkandmilkpowderbyliquidchromatography-tandemmassspectrometry(LC-MS-MS)wasdeveloped.Sampleswereextractedwithacetonitrilecontaining0.1%formicacidby
5、volume.AfterlitIidremovalbyliquid—liquidextractionwithn-hexane,thepurificationoftheextractwascarriedoutonanOasisHLBcartridgebysolid-phaseextraction.TheanalyteswereseparatedonaC8columnemployingamobilephasecomposedofamixtureofmethanolwithO.1%formicacidand0。l%formicforgradie
6、ntelution.Thetandemmassspectralacquisitionwasdoneinthepositiveelectrosprayionizationmodeutilizingmultiplereactionmonitoring.Externalstandardmethodwasappliedforquantization.Theresultsindicatedthatthelimitsofquantification(LOQs,RsN=lO)for20targetcompoundsrangedfrom0.1to1.0~
7、tg/kg,andthelinearrangewas0.05—50g/Lwithcorrelationcoeficientslargerthan0.996.Theaveragerecoveriesatdifferentspikedconcentrationlevelsrangedfrom52.8%to97.4%withRSDof2.8%.6%=6).TheproposedmethodhasbeenappliedfortherapiddeterminationofrealsamplesofmilkandIniIkpowderwithsimp
8、leoperationandaccurateresults.Keywords:liquidchrorna~graphy-tandemmassspectrometry(LC—MS—Ms);ana